Steam-engine indicator.



BEST ABLE com No. 648,700. Patented Apr. 3, I900.

- W. HOUGHTALING.

STEAM ENGINE INDICATOR.

(Application filed Aug. 18, 1899.) (No Model.) 2 ShaetsSheei I.

@qw b (Manama/m1 95 film no! BEST AVAILABLE com No. 646,700. PatentedApr. 3, 1900. W. HUUGHTALING.

STEAM ENGINE INDICATOR.

(Application filed Aug. 18, 1899.}

(No Model.) 2 SheetsSheel 2.

vi/l wcaozo 5:52 010 im 0: M Wmamm 3 gum/Mug EST , WILLIAMIIOUGHTALING,OF nnipenPon'r, CONNECTICUT, 'ASSIGNOR TO THE ASHCROFT MANUFACTURINGCOMPANY, OF SAME PLACE.

STEAM-ENGINE INDICATOR.

SPECIFICATION forming partjof Letters Patent No. 646,700, dated April 3,1900. Application filed August 18, 1899. Serial No. 727,637. No model.)

To all whom it may concern:

Be it known that I. WILLIAM HOUGHTAL- ING, a citizen of the UnitedStates, residing at Bridgeport, in the county of Fairfield and State ofConnecticut, have invented'certain new and useful Improvements inSteamingine Indicators, of which the following is a specification,reference being had therein to the accompanying drawings.

The invention relates to improvements in steam-engine indicators inwhich the pressu re-spring is located outside the steam-cylihder. Theobject of placing the spring outside the steam-cylinder is to avoid theaction of the steam in contact, which deteriorates it, causing it tolose its efficiency, besides being difficult to change when desired.

g The present invention consists in placing. the pencil mechanism anddiagram-cylinder at the side and parallel on a plane with the spring,whereby the instrument is rendered more compact and convenientlyhandled, and

connecting the mechanism therewith in such manner as to facilitate adetachment of the same and permit perfectfreedom of movement at allpoints of the spring compression.

To enable others skilled in the art to make and 'use my invention, Iwill first proceed to describe an indicator embodying my invention, andsubsequently will point out in the claims what I desire to secure byLetters Y Patent.

In the drawings, Figure 1 is a plan view, Fig. 2 a side elevation, andFig. 3 a sectional elevation, on a line 3 3 of Fig. 1, of an indicaterembodying my invention. Fig. 4. is a plan View of the. cap ito which thesprings are secured. Fig. 5 is a detail view showing a tension-springemployed instead of the compression-spring shown in Fig. Fig. 6 is aplan view of Fig. 5. Figs, 7 and 8 are detail views, and Fig. 9 a planview of Fig.

The cylinder A is revolubly mounted u on asupporting-base-B, theoperatingcord or clt a passing over the guide-pulley a and impartingmotion to the ""cylinder A. A" strip of paper A is held on the peripheryof the cylinder A by the spring-clamps (t Opposi ely located from thecylinder A is the steam-cylinder G, secured at the base B. Withinthecylinder O is the piston c, sop tired 'ing the The springs D, Fig. 8,are secured at their upper ends in the block 0 having grooves a, throughwhich the ends pass and are rigidly secured in the lugs c and at theirlower ends in the block a, similar in every way to the block 0". Toremove the springs D, it is only necessary to remove the retaining-studc. Fig. 3, and then unscrew the spring D from the plug c", which may besecured in any suitable manner to the piston-rod c.

Secured to and extending laterally from 350 rod 0 is an arm 0, its freeend engaging ie flanges of a collar e, secured on the free acting pin E,as shown in Fig.

pencil arm G.

A bifurcated arm g is on the block g, (see Fig. and is pivoted with thepencil-arm G, carrying a pencil g, which contacts with the paper A onthe cylinder A. The arm G. is guided in its movement by a pin g, whichengages with slots or grooves in the upright pieces H, as shown in Fig.2.

Fig, 5 illustrates a slight structural change, permitting the use of anextension-spring D instead of the compression-spring D. (Illustrated inFigs. 2ai1d 3.) In the construction shown in Fig. 5 the rod pivotallysupported 2,) and at its upper upper spring end 0 by the plug c andlocknut c. The spring may be conveniently replaced by another byunscrewing the same from the extending screw-neck d of standard (I andwithout disturbing any other parts of the indicator.

The operation is similar to the ordinary indicator, steam being admittedinto the cylinder C under the piston c, causing the latter to risevertically, carrying the rod 0' and its laterally-extending arm 0, thelatter engagfree-acting pin E, which raises the arm G, carrying thepencil 9 in a straight line and parallel with the axis of the cylinder.

I claim 1. In a steam-engine indicator, 8. steamcylinder provided with apiston and a piston rod; the latter extending outside the cylin- 3, thepin Ev being bifurcated at its upper end to receive. a bifurcated arm e,which is pivoted to the c e -Ltends upwa: dly' through the spring D andis attached to the BEST AVAILABLE COP? (lei-and connected with anexternal spring, in

of the pencil mechanism, substantially asset forth.

2. .In a steam-engine indicator the combination of theepiston-rod c thearm 0 and pen- IO cil-mechanism-Operating god E the arm 0 bel ing fixedto lhe-piston-rod c'and its free end i engaging with the operating-r0d Eof the pencil mechanism, substantially as set forth.

i l I In testimony whereof I aflix my signature in presence of twowitnesses.

\\'itnesses:

W. R. CLARKE, S. S. DE Vomnx.

